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@@ -18,7 +18,7 @@ The Session Controller appends every Client-only live chunk to its event source,
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Keeping the live Think row horizontally pinned to the end of the accumulated text is purely visual alignment and does not require synchronous layout reads on every React commit. An in-component scheduler coalesces consecutive requests into one update every three frames, reads `scrollWidth` and `clientWidth` from the latest DOM, and updates `scrollLeft` directly to the latest position; the fixed visual cadence keeps summary changes readable without allowing browser smooth-scroll animations to accumulate. This throttling applies only to Think's horizontal summary and does not delay Chat body scrolling, history-prepend anchoring, or user-triggered `scrollIntoView`.
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-`pnpm run test:web:stress` remains keyless, opt-in browser performance evidence. A test-owned model adapter emits 100,000 `reasoning-delta` chunks through the real Host, Gateway, WebSocket, Session reduction, and live Think row. Each 128-chunk batch waits for one browser timer turn before the next batch, so the 250-millisecond heartbeat and pre-scheduled DOM event measure one bounded ingestion/render interval instead of accumulated socket backlog. A terminal marker proves that all chunks reached the UI. `DSH_WEB_STRESS_HEADFUL=1` lets developers profile the same scenario in a visible browser with the Performance panel. The stress lane is evidence for manual performance diagnosis and fix acceptance, not a default CI gate or a substitute for deterministic scheduling unit tests.
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+`pnpm run test:web:stress` remains keyless, opt-in browser performance evidence. A test-owned model adapter emits 100,000 `reasoning-delta` chunks through the real Host, Gateway, WebSocket, Session reduction, and live Think row. Each 128-chunk batch waits for one browser timer turn before the next batch, so a 50-millisecond heartbeat and a pre-scheduled DOM event measure one bounded ingestion/render interval instead of accumulated socket backlog against a 250-millisecond budget. A terminal marker proves that all chunks reached the UI. `DSH_WEB_STRESS_HEADFUL=1` lets developers profile the same scenario in a visible browser with the Performance panel. The stress lane is evidence for manual performance diagnosis and fix acceptance, not a default CI gate or a substitute for deterministic scheduling unit tests.
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Focused tests pin `Notifier`'s per-frame coalescing, structural-event preemption, invalidated callbacks, and no-rAF fallback, and prove at the `Session` layer that a frame publishes the latest accumulated text only once and that finalization is not followed by a duplicate notification from a stale frame callback. The opt-in browser case owns adapter pacing, exact event count, and terminal-marker delivery without bringing the 100,000-chunk workload into the default test suites.
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@@ -30,6 +30,8 @@ Focused tests pin `Notifier`'s per-frame coalescing, structural-event preemption
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**Microtask batching alone.** Rejected: consecutive asynchronous `yield` operations can drain the microtask queue between adjacent chunks, making microtask batching approximate one notification per chunk.
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+**Pacing the test producer by animation frames.** Rejected: the producer would slow whenever rendering slowed, giving the page implicit backpressure absent from a real network stream and masking main-thread starvation.
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**Sending the former browser-local rate through the WebSocket without an acknowledgment.** Rejected: queued transport work accumulates faster than a model can produce it and turns the result into a socket-backlog measurement. A browser timer acknowledgment bounds each batch while the heartbeat still detects a batch that starves the page.
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**A live external model or recorded HTTP byte stream.** Rejected: an external model is nondeterministic, and an HTTP recording would add a second fixture format without improving the target assertion. The test-owned adapter preserves individual chunks through the real Host and browser transport while controlling the workload.
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imccyu